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Octave compatibility of
factor with sym input
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| function y = factor(varargin) | ||
| % Fixes different output for symbolic input in Octave compared to Matlab, by using the two-output | ||
| % version in Octave | ||
| if ~isa(varargin{1},'sym') | ||
| y = builtin('factor', varargin{:}); | ||
| else | ||
| % `builtin('@sym/factor', varargin{:})` does not work. So the following is taken from Octave's | ||
| % `sym/factor`, with a header and a footer to call the two-output version | ||
| nargout = 2; | ||
| f = varargin{1}; | ||
| varargin = varargin(2:end); | ||
| for i = 1:length(varargin) | ||
| varargin{i} = sym(varargin{i}); | ||
| end | ||
| if ((nargin > 1) || (~isempty (findsymbols (f)))) | ||
| % have symbols, do polynomial factorization | ||
| if (nargout > 1) | ||
| print_usage (); | ||
| end | ||
| p = python_cmd ('return factor(*_ins)', f, varargin{:}); | ||
| else | ||
| % no symbols: we are doing integer factorization | ||
| if (nargout <= 1) | ||
| if (~isscalar(f)) | ||
| error('FIXME: check SMT, allows array input here?') | ||
| end | ||
| % this is rather fragile, as noted in docs | ||
| p = python_cmd ('return factorint(_ins[0], visual=True),', f); | ||
| else | ||
| if (~isscalar(f)) | ||
| error('vector output factorization only for scalar integers') | ||
| end | ||
| cmd = { 'd = factorint(_ins[0], visual=False)' | ||
| 'num = len(d.keys())' | ||
| 'sk = sorted(d.keys())' | ||
| 'p = sp.Matrix(1, num, sk)' | ||
| 'm = sp.Matrix(1, num, lambda i,j: d[sk[j]])' | ||
| 'return (p, m)' }; | ||
| [p, m] = python_cmd (cmd, f); | ||
| end | ||
| end | ||
| m = double(m); | ||
| y = sym(NaN(1, sum(m))); | ||
| k = 1; | ||
| for h = 1:numel(m) | ||
| y(k:k+m(h)-1) = repmat(p(h), 1, m(h)); | ||
| k = k+m(h); | ||
| end | ||
| end | ||
| end |
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